Scooby's Laff-A Lympics - Season 1 - Eps 34: Shadowman (1)
Lurking in Big City is The Shadowman, who mysteriously knows all of the plans of The Crime Commission. The Daring Duo are called in when the 700-karat Shmope Diamond is swiped. As they respoind, they spot a shadow sneaking off with plates for new $20 bills stolen from an armored car. The Shadowman later manages to kill two birds with one stone by making off with a secret gold shipment and framing Mayor Gaunt (who is captured in The Dyno Bad Guy Box) all in one shot.
About Scooby's Laff-A Lympics

Title: Scooby's Laff-A Lympics
First Air Date: 1977-09-10
Last Air Date: 1978-10-28
Status: Ended
Rating: 8.15/10 (from 127 votes)
Language: EN
Seasons: 3
Total Episodes: 94
Network: ABC
Genres: Animation, Comedy, Kids, Family, Mystery
Production Companies: Hanna-Barbera Productions
Synopsis
Each episode of this series include multiple segments: The first and last were "Laff-A-Lympics" segments, the other ones were "Captain Caveman and the Teen Angels", "Scooby-Doo" and "Dynomutt" segments. The "Laff-A-Lympics" segments feature 45 Hanna-Barbera cartoon characters (classic and otherwise) competing for gold medals in wacky events. Events include racing on ostriches, camels, kangaroos, rickshaws and unicycles, as well as scavenging for creatures like the Abominable Snowman, vampires, and the Loch Ness Monster.
Cast

Don Messick
Announcer / Boo Boo Bear / Scooby-Doo / Mr. Creeply (voice)

Daws Butler
Snagglepuss / Yogi Bear / Quick Draw McGraw / Various (voice)

John Stephenson
Mildew Wolf / Dread Baron / Great Fondoo / Doggie Daddy (voice)

Casey Kasem
Shaggy Rogers (voice)

Scatman Crothers
Hong Kong Phooey (voice)

Frank Welker
Dynomutt / Jabberjaw / Magic Rabbit / Sooey Pig (voice)

Mel Blanc
Barney Rubble / Captain Caveman / Speed Buggy (voice)

Julie Bennett
Cindy Bear (voice)

Marilyn Schreffler
Brenda Chance / Daisy Mayhem (voice)

Vernee Watson-Johnson
Dee Dee Skyes (voice)